Pericardiacophrenic arteryThe pericardiacophrenic artery is a long slender branch of the internal thoracic artery.AnatomyOriginThe pericardiacophrenic artery branches from the internal thoracic artery.CourseThe pericardiacophrenic arteries travel through the thoracic cavity. They course through the fibrous pericardium. The pericardiacophrenic artery accompanies the phrenic nerve between the pleura and pericardium, to the diaphragm. This is where both the artery and the phrenic nerve are distributed.DistributionThe pericardiacophrenic arteries provide arterial supply to the fibrous pericardium, and the diaphragm.AnastomosesIt anastomoses with the musculophrenic, and superior phrenic arteries.